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GST Late Fee Calculator

Work out gst late fee instantly with clear inputs, formula shown and shareable results.

About GST Late Fee Calculator

Late filing attracts a daily fee subject to a cap, while unpaid tax attracts interest on a daily basis. The fee accrues even on a nil return, which is why dormant registrations still need filing.

Formula

Late filing cost

Fee = min(per-day fee × days, cap); interest = tax × rate × days / 365

Worked example

With the default values below, GST Late Fee Calculator returns Total Amount Payable of $154,958.90. Change any input above and every figure here is recalculated in your browser.

Inputs used

Tax Dueminimum 0
150,000
Days Lateaccepts 1–730
40
Late Fee Per Dayminimum 0
50
Interest Rate Per Annumaccepts 0–40 %
18 %

Results

Total Amount Payable
$154,958.90
Late Filing Fee
$2,000.00
Interest On Tax Due
$2,958.90
Penalty As Share Of Tax Due
3.306%

Step by step

  1. 1Values used
  2. 2Late filing cost
  3. 3Total Amount Payable= 154,958.90
  4. 4Late Filing Fee= 2,000.00
  5. 5Interest On Tax Due= 2,958.90
  6. 6Penalty As Share Of Tax Due= 3.306

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Tax figures are estimates based on the rates, caps and thresholds you enter. Real rules differ by jurisdiction and change every year, and personal circumstances alter the outcome. This is not tax or financial advice — confirm with a qualified adviser.
  • This is an estimate for general information and not professional financial, tax or legal advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Tax figures are estimates based on the rates, caps and thresholds you enter. Real rules differ by jurisdiction and change every year, and personal circumstances alter the outcome. This is not tax or financial advice — confirm with a qualified adviser.

Frequently Asked Questions

Is the fee payable on a nil return?

Yes, usually at a reduced daily rate. The obligation is to file, not merely to pay.

Can interest be avoided by filing without paying?

No. Interest runs on unpaid tax regardless of whether the return was filed.

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GST Late Fee Calculator – Calculate Total Amount Payable